Go patch committed: Use backend interface for set-and-use temps

[Ian Lance Taylor]

This patch by Chris Manghane changes the Go frontend to use the backend
interface for set-and-use temporary variables.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


diff -r 9ec9e72945e4 go/expressions.cc
--- a/go/expressions.cc	Mon May 05 13:54:25 2014 -0400
+++ b/go/expressions.cc	Mon May 05 14:40:12 2014 -0400
@@ -890,16 +890,16 @@
 tree
 Set_and_use_temporary_expression::do_get_tree(Translate_context* context)
 {
+  Location loc = this->location();
+  Gogo* gogo = context->gogo();
   Bvariable* bvar = this->statement_->get_backend_variable(context);
-  tree var_tree = var_to_tree(bvar);
-  tree expr_tree = this->expr_->get_tree(context);
-  if (var_tree == error_mark_node || expr_tree == error_mark_node)
-    return error_mark_node;
-  Location loc = this->location();
-  return build2_loc(loc.gcc_location(), COMPOUND_EXPR, TREE_TYPE(var_tree),
-		    build2_loc(loc.gcc_location(), MODIFY_EXPR, void_type_node,
-			       var_tree, expr_tree),
-		    var_tree);
+  Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc);
+
+  Bexpression* bexpr = tree_to_expr(this->expr_->get_tree(context));
+  Bstatement* set = gogo->backend()->assignment_statement(var_ref, bexpr, loc);
+  var_ref = gogo->backend()->var_expression(bvar, loc);
+  Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc);
+  return expr_to_tree(ret);
 }
 
 // Dump.